What would have happened if the US was not the first country to develop the nuclear bomb? What would have happened if the Nazis, Stalin, Mao or the Imperial Japanese Empire had the bomb first? No doubt after numerous live demonstrations on target cities, the world would have been subjugated to the particular brand of sadistic totalitarian control.
As technology progresses, additional existential threats to humanity will happen more regularly; the most frequently noted being in biological engineering, artificial intelligence and nanotechnology. Technology is also making it ever easier to centrally track and control people’s behaviour, enabling the ideal conditions for any strain of despotic regime to thrive.
Given the stakes and the alternatives, we have to get better.